Hearthpwn

Mulligan:  Argent Squire Sap Eviscerate Knife Juggler Loot Hoarder Spider Tank SI:7 Agent and, if you have enough early game drops: Chillwind Yeti

This matchup is pretty much automatic win. Malfurion has no way to counter your tempo, since Druids always lose to decks that simply are too fast. I'm 14-0 against Druids at the moment. I'd rate the matchup as 85-15 for you.

Key in this game is to do your plays on curve and remove enemy minions ASAP. If Druid Innervates out minion, Sap it immediately. So you just have to worry about keeping his side of the board clear and spamming minions at the same time.

Mulligan: Backstab Argent Squire Deadly Poison Eviscerate Knife Juggler Loot Hoarder Bloodmage Thalnos Spider Tank SI:7 Agent Kezan Mystic and, if you have enough early game drops: Chillwind Yeti 

This matchup in 55-45 for you. Face Hunter always concedes the game when you steal his Explosive Trap. Your start is really strong due to mulligan which is so allowing that it almost never fails. As a Rogue, you have so many answers to Hunter's early game that he pretty much just can't take it. However, you should be aware of Knife Juggler + Unleash the Hounds and play around traps, because you can afford to do it. Face Hunter matchup may seem like unbeatable at first and sometimes you may need a blessing from the almighty RNGsus when it comes to drawing, but this deck is very flexible with the removals, and often you'll draw them before it's too late.  Each turn alive is one more turn closer to win, because Hunter just can't do anything after midgame.

Early game's rule of thumb: Kill his minions. After you've almost cleared his board, you can start "wasting" your turns by playing "only" Chillwind Yeti and after that it's just clearing his board easily and going face with all the spells and buffs.

Mulligan: Backstab Argent Squire Deadly Poison Eviscerate Knife Juggler Loot Hoarder Bloodmage Thalnos Spider Tank SI:7 Agent Kezan Mystic and, if you have enough early game drops: Chillwind Yeti

I haven't played against that many mages. Freeze Mage is really tough, but if you steal her Ice Block when Jaina thinks that you're just going to pop it AND you have enough damage for lethal, you might steal a win. Mech Mage is exactly 50/50, and the game goes to the player who has better start. Tempo Mage can be really tough since your minions in the early game don't have that much health and Flamewaker combined with spells can be really devastating. If you get good enough start, you can outpace any kind of Mage. I'd rate the matchup as 50/50 right now, but it might change soon, after I've done a bit research about the matchups.

Mulligan: Backstab Argent Squire Deadly Poison Knife Juggler Loot Hoarder Spider Tank SI:7 Agent and, if you have enough early game drops: Chillwind Yeti 

I haven't faced that many Paladins, but I'm 6-1 against them right now. Matchup is favored for you, maybe about 60/40. You have to beware of Consecration because if you don't, you'll lose. If you play around it, you are going to win the game, unless Paladin somehow get's the tempo back until turn 7. Just Sap his taunts and midgame legendaries an you should do fine.

Mulligan: Backstab Argent Squire Deadly Poison Eviscerate Sap Knife Juggler Loot Hoarder Bloodmage Thalnos Spider Tank SI:7 Agent and, if you have enough early game drops: Chillwind Yeti 

This matchup is very, very favored for you. If you deal with his Northshire Cleric and Injured Blademaster during turns 1-4, you win the game. Priests can't handle such big tempo losses, which are easily caused by this deck, since you have so many ways to deal with every minion of his. Even the AOE damage doesn't hurt you that much, since you can get back in to the game super fast. This is 90/10 matchup for you.

In the early game, get rid of all the minions of his and go face as much as you can. You shouldn't lose that much mana by clearing his side of the board, since Sap is your most expensive removal. Rest of the game, make sure that he doesn't get board control and just use the pace this deck has. As Hunter players on Twitch would say, SMOrc FACE IS THE PLACE SMOrc.

Mulligan: Backstab Argent Squire Deadly Poison Eviscerate Sap Knife Juggler Loot Hoarder Bloodmage Thalnos Spider Tank SI:7 Agent and, if you have enough early game drops: Chillwind Yeti

Fun fact, I haven't played a single game against Rogue with this deck. Just try and remove her minions with removal spells and don't let her combo you, I guess.

Mulligan: Backstab Argent Squire Deadly Poison Eviscerate Sap Knife Juggler Loot Hoarder Bloodmage Thalnos Spider Tank SI:7 Agent and, if you have enough early game drops: Chillwind Yeti

I haven't played that many games against Shaman. I'd say that the matchup is unfavored for this deck, since Thrall has removals for pretty much everything. Just try and remove all his creatures from the board and don't play straight into Lightning Storm by emptying your whole hand before he hasn't played any Storms.

Mulligan: Backstab Argent Squire Deadly Poison Eviscerate Sap Knife Juggler Loot Hoarder Bloodmage Thalnos Spider Tank SI:7 Agent and, if you have enough early game drops: Chillwind Yeti

This is a tough matchup. I'm 2-7 against zoo myself, since that deck just has too much early game potential, which this deck can't deal with efficiency. My stats against Handlock is 4-1, which is also really tough matchup, even though the stats don't say it. The matchup against Warlock is hard to tie off, but I'd say 40-60 in Warlock's favor.

Against Zoo you have to make sure that you always have some minions ready to trade with his, while playing your removal spells at the same time. You have to hope for a bad start on his side to stay in the game. There's nothing else to say on the matchup against Zoo. Against Handlocks, the Important part is to play your two copies of Sap against the early game Mountain Giants and Twilight Drakes! When he's at 14-16, wait until you have enough damage for final burst. Never overextend to AOE removals, Handlocks are known for  Shadowflames and Hellfires!

Mulligan: Backstab Argent Squire Deadly Poison Eviscerate Knife Juggler Loot Hoarder Bloodmage Thalnos Spider Tank SI:7 Agent and, if you have enough early game drops: Chillwind Yeti 

The matchup is favored for this deck, I'd say at least 55-45. You have to get rid of his early game Armorsmith and minimize the card draw from Acolyte of Pain and you should do fine. Beware of Brawl against Control Warrior, and use your Saps against his first strong minions to win more tempo. Against Patron Warrior the matchup is really tough, since they can pull the combo out of nowhere. I'd just race Patron Warriors and see who has lethal first. Remember that they don't have many removals, so I don't see anything bad on overextending the board.